Ag/Ag2O/BiNbO4 structure for simultaneous photocatalytic degradation of mixed cationic and anionic dyes

Fabrication, functionalization and performance of doped photocatalysts for dye degradation and mineralization: a review

“…Recently, Palanivel et al (2019) observed that in the mixed-dye system, the degradation range of methylene blue was quite higher than that with rhodamine B under sunlight illumination under the presence of hydrogen peroxide and that the methylene blue photodegradation reached 100% under sunlight irradiation within 35 min, whereas the photodegradation of rhodamine B attained 92% after the same duration in the presence of hydrogen peroxide. Lastly, Lebedev et al (2019) examined the photocatalytic degradation of mixed basic and acidic dyes by a single catalyst, Ag/ Ag 2 O/BiNbO 4 . Whilst the mixed system comprising rhodamine B and Acid Red 1 was not examined due to their overlap of absorption spectra observed in the 500-550 nm, complete photodegradation of methylene blue and Acid Red 1 in methylene blue-Acid Red 1 mixed systems of 1:1, 2:1 and 1:2 (on a volume basis) was observed with treatment by 0.015 g of 7 wt% Ag-loaded BiNbO 4 (Lebedev et al 2019).…”

“…Lastly, Lebedev et al (2019) examined the photocatalytic degradation of mixed basic and acidic dyes by a single catalyst, Ag/ Ag 2 O/BiNbO 4 . Whilst the mixed system comprising rhodamine B and Acid Red 1 was not examined due to their overlap of absorption spectra observed in the 500-550 nm, complete photodegradation of methylene blue and Acid Red 1 in methylene blue-Acid Red 1 mixed systems of 1:1, 2:1 and 1:2 (on a volume basis) was observed with treatment by 0.015 g of 7 wt% Ag-loaded BiNbO 4 (Lebedev et al 2019). Moreover, Lebedev et al (2019) reported that the net degradation of Acid Red 1 (attaining 85%) was independent of volume ratio, whilst the degradation of methylene blue was influenced by the volume ratio; degradation behaviours which were set on account of the different p-type and n-type materials taking part in the reactions during the degradation process.…”

Photocatalytic Applications of SnO2 and Ag2O-Decorated SnO2 Coatings on Cement Paste

“…However, for the mixture, the behavior of MR follows the MB trend with a reduction in the degradation efficiency in Ag1 and an increase in Ag3, when compared to the reference. Therefore, the combination of anionic and cationic dyes presents a favorable characteristic regarding the degradation of MR, once the literature shows that solutions of individual dyes may give better results than when there is more than one dye in the same solution [85][86][87]. Another characteristic of photocatalysis is that it is sensitive to pH variations.…”

Urea-assisted synthesis of carbon-doped BiNbO4 with oxygen vacancies and visible light photocatalytic applications

“…7, photoelectrons are the primary reactive species affecting the degradation process, followed by ˙OH radicals and photo-holes. The proposed sequence of chemical reactions is the following: 13,16,25,36 U-BiNbO 4 + hν → U-BiNbO 4 + e − + h + e − + H 2 O 2 + H + → H 2 O + ˙OH˙OH + H 2 O + h + → H 2 O 2 + H + …”